Morphological change of the mouth bar in relation to natural and anthropogenic interferences

He, Yong; Wu, Yao; Lu, Chen; Wu, Menwu; Chen, Ying; Yang, Yugui

doi:10.1016/j.csr.2019.01.015

Cited by 21 publications

(10 citation statements)

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“…The issue of human impacts reflected in such activities as the development of science and technology, exploitation and waste of natural resources, and food production was discussed extensively by Steffen et al (2004) and Nielsen (2006). It was also discussed by many other authors, presenting studies of individual aspects of numerous processes associated with the currently experienced human activities, for instance by Cui, et al (2006), Delgado et al (2012), Pacheco et al (2013), Roder et al (2013), Fletcher and Hughes (2017), DellaSala et al (2018) and by He et al (2019).…”

Section: Resultsmentioning

confidence: 99%

The Great Deceleration and proposed alternative interpretation of the Anthropocene

Nielsen

2021

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Is the Anthropocene a new geological epoch and can its beginning be determined? The so-called Great Acceleration data, used repeatedly in support of the concept of the Anthropocene as a new geological epoch, are closely examined. They are supposed to be characterised by a clear intensification of growth (sharp increase, acceleration) in the mid-20th century. They revealed the opposite effect: they are characterised by decelerations either at precisely the same time when accelerations were expected or over the entire range of data, the phenomenon described here as the Great Deceleration. Implications of this study are two-folds: (1) contrary to expectations, these data cannot be used to determine the beginning of the Anthropocene and (2) the common deceleration questions whether humans alone can cause a transition to a new geological epoch. Investigation of the growth of the genus Homo in the past 2,000,000 years suggests that what is now called the Anthropocene could be just a natural continuation of the gradual evolution of human activities and impacts over a long time, without a sudden intensification and without a convincing evidence for a transition to a new geological epoch.

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Section: Resultsmentioning

confidence: 99%

The Great Deceleration and proposed alternative interpretation of the Anthropocene

Nielsen

2021

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“…terrain attributes, feature extraction, automated classification) became well established and have been extensively applied to the marine environment ([42],[43]). The most recent studies based on high resolution repeated multibeam surveys focused on assessment of change in patterns of habitat distribution or on natural spatio-temporal morphological evolution (see for example [44]; [45]; [46]; [47]; [48]; [49]; [50]; etc.). However, as far as we know, the combination of high resolution data from MBES surveys and geomorphometric and sedimentological analysis has not been used to assess quantitatively and monitor the seafloor changes over time induced by newly built hard defence structures and more generally by coastal infrastructures.…”

Section: Introductionmentioning

confidence: 99%

Tidal inlet seafloor changes induced by recently built hard structures

et al. 2019

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Tidal inlets are extremely dynamic environments that are often strongly modified by anthropogenic intervention. In this study, we describe the rapid evolution of a highly human-impacted tidal inlet, studied through repeated high-resolution multibeam surveys and geomorphometric analysis. We document the rapid change induced by new hard coastal structures built to protect the historical city of Venice (Italy). A new breakwater erected between 2011 and 2013 induced the formation of large scour holes with the consequent erosion of about 170 · 103 ± 15.6% m3 of sediment until 2016. The construction of a new island in the middle of the inlet and the restriction of the inlet channel caused a general change of the inlet sedimentary regime from depositional to erosive with a net sediment loss of about 612 · 103 ± 42.7% m3, a reduction of the dune field area by more than 50% in about five years, and a coarsening in the sediment distribution. Our results give new insight on the tidal inlet resilience to changes, distinguishing two different phases in its recent evolution: (i) a very rapid response (from 2011 to 2013) of the seafloor morphology with scour-hole erosion at the new breakwater tips at a rate of about 45⋅103 m3/year and the disappearing of dune fields at a rate of 104⋅103 m2/year; and (ii) a general slowdown of the erosive processes from 2013 to 2016. Nevertheless, the erosion continues at the breakwater, though at a reduced rate, possibly representing a threat to the hard structure. In view of global mean sea level rise and consequent proliferation of hard structures along the coast all over the world, the combined use of very high resolution multibeam surveys and repeatable geomorphometric analysis proposed in this study will be crucial for the monitoring and future management of coastal environments.

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“…The region of study is the Pearl River Delta, China, the city of cities and the largest megalopolis in the world both in terms of population and urbanized area since 2010 (World Bank, 2015), which includes two megacities (population >10 M) and several cities with over 1 M habitants. The region has undergone rapid development since the 1980s and the morphology and hydrology of the Pearl River Delta have been heavily modified by human interventions such as dam construction (e.g., Cai et al., 2012; Cai et al., 2019; S. Zhang et al., 2008; W. Zhang et al., 2012), channel dredging (e.g., Cai et al., 2012; Cai et al., 2019; He et al., 2019; Luo et al., 2007; W. Zhang, Cui, et al., 2010; Z.; Wu et al., 2018), and land reclamation of intertidal wetlands (e.g., Cai et al., 2019; He et al., 2019; W. Zhang et al., 2010, 2015, Z. Wu et al., 2018).…”

Section: Methodsmentioning

confidence: 99%

“…Zhang et al, 2012), channel dredging (e.g., Cai et al, 2012;Cai et al, 2019;He et al, 2019;Luo et al, 2007;W. Zhang, Cui, et al, 2010;Wu et al, 2018), and land reclamation of intertidal wetlands (e.g., Cai et al, 2019;He et al, 2019;W. Zhang et al, 2010, 2015, Z. Wu et al, 2018.…”

Section: Case Study: Modaomen Branch Of the Pearl River Deltamentioning

confidence: 99%

Multiscale Temporal Response of Salt Intrusion to Transient River and Ocean Forcing

et al. 2022

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Salt intrusion in surface waters endangers freshwater availability, influences water quality, and affects estuarine ecosystem services with high economic and social values. Salt transport and the resulting salinity distributions result from the non‐linear interactions between salt and water dynamics. Estuaries are often considered under (quasi)‐steady assumption or by focusing on specific timescales. Our understanding of their temporal multiscale response to transient forcing is limited, which hinders the implementation of effective mitigation strategies. We apply wavelet analyses to quantify the variability of salt intrusion from hourly to seasonal timescales and unravel the temporal variability of its response across scales. We focus on an estuary that undergoes significant transient forcing, the Modaomen estuary in the Pearl River Delta, and apply the wavelet analyses to year‐long data generated by a coastal ocean numerical model. Our results show that this estuary responds to changes in tidal and riverine forcing throughout the year over interwoven timescales. Our results highlight the temporal variability of the salt intrusion response time both within a given regime and for the transition between regimes. They also suggest that tides control the response time more strongly than river discharge, even though river discharge determines the magnitude of the salt intrusion, and thus modulates the evolution of the salt intrusion response time. We propose a broadly applicable framework to calculate response times with simple data. These results can provide a first‐order guidance for design and implementation of estuarine management strategies and mitigation measures that ensure water access and facilitate sustainable development.

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Morphological change of the mouth bar in relation to natural and anthropogenic interferences

Cited by 21 publications

References 50 publications

The Great Deceleration and proposed alternative interpretation of the Anthropocene

The Great Deceleration and proposed alternative interpretation of the Anthropocene

Tidal inlet seafloor changes induced by recently built hard structures

Multiscale Temporal Response of Salt Intrusion to Transient River and Ocean Forcing

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